Tc 9-524 fundamentals of machine tools

7-56

---

TC 9-524
rings on the work surface (Figure 7-94). Check the operation to
ensure that the knurling tool is not forcing the work from the
center hole. Keep the work and knurling tool well oiled
during the operation. Never allow a brush or rag to come
between the rollers and the work or the knurl will be ruined.
Reset the tool if needed; otherwise, move the carriage and
tool back to the starting point and lightly bring the tool back
into the previously knurled portion. The rollers will align
themselves with the knurled impressions. Force the knurling
tool into the work to a depth of about 1/64 inch and
simultaneously engage the carriage to feed toward the
headstock. Observe the knurling action and allow the tool to
knurl to within 1/32 inch of the desired end of cut, and
disengage the feed. Hand feed to the point where only one-
half of the knurling wheel is off the work, change the feed
direction toward the tailstock and force the tool deeper into
the work.
Engage the carriage feed and cut back to the starting point.
Stop the lathe and check the knurl for completeness. Never
allow the knurling tool to feed entirely off the end of the
work, or it could cause damage to the work or lathe centers.
The knurl is complete when the diamond shape ( or straight
knurl) is fully developed. Excessive knurling after the knurl
has formed will wear off the full knurl and ruin the work
diameter. Move the tool away from the work as the centers.
The knurl is complete when the diamond shape (or work
revolves and shut off the lathe. Clean the knurl with a brush
and then remove any burrs with a file.
Special Knurling Precautions
Never stop the carriage while the tool is in contact with the
work and the work is still revolving as this will cause wear